#include<bits/stdc++.h>
#define el '\n'
#define int long long
using namespace std;
struct st
{
int s,d,c,j;
};
bool comp(st one, st two)
{
return one.d<two.d;
}
int n,m;
int ans[105];
void sol()
{
cin>>n>>m;
st a[m];
for(int i=0;i<m;i++) {
cin>>a[i].s>>a[i].d>>a[i].c;
a[i].j=i+1;
ans[a[i].d]=m+1;
}
sort(a,a+m,comp);
//for(int i=0;i<m;i++) cout<<a[i].s<<' '<<a[i].d<<' '<<a[i].c<<' '<<a[i].j<<el;
for(int i=0;i<m;i++) {
int dem=0;
for(int g=a[i].s;g<a[i].d;g++) {
if(ans[g]==0) {
ans[g]=a[i].j;
dem++;
if(dem==a[i].c) break;
}
}
if(dem<a[i].c) {
cout<<-1;
return ;
}
}
for(int i=1;i<=n;i++) cout<<ans[i]<<' ';
}
signed main()
{
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
/*int t; cin>>t;
while(t--)*/ sol();
return 0;
}
/*
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██╔═══╝░██╔══██║██║╚██╔╝██║██║░░██║██║░░░██║██║░░██╗██║░░██╗░░░██║░░░██║██║╚████║
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*/
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